The wireless simultaneous transmission system currently has three modes of low frequency transmission, infrared transmission and ultra-high frequency transmission.
1. Low-frequency transmission simultaneous transmission system: Also known as electromagnetic induction type interpretation system, it is a loop line in the listening range, which is fed by a high-power audio amplifier to generate a strong audio electromagnetic field. The listener listens to headphones that are driven by the input core coil and amplifier. This system is simple and inexpensive, but has poor sound quality and stability. Because low-frequency electromagnetic fields can penetrate ordinary buildings and thus have poor confidentiality, they are especially suitable for museums, science museums, and some large convention and exhibition centers that require multiple sub-sites to use the same set of simultaneous transmission systems. Disadvantages become advantages.
2. Infrared transmission simultaneous transmission system: Infrared (IR) refers to electromagnetic radiation with a wavelength exceeding red visible light, and its frequency is above 2 MHz. Infrared rays do not penetrate the wall, so they are confidential and resistant to radio interference and eavesdropping. Due to its stable performance and better sound quality, it has become the mainstream equipment of the simultaneous transmission system. In recent years, a development trend of infrared simultaneous transmission technology has shifted from the earlier BAND II (45 kHz to 1 MHz) frequency band to the higher BAND IV (2 to 6 MHz) frequency band to avoid energy-saving lamps. Interference caused by high frequency driven light sources. In addition, the BAND IV frequency band has wide frequency response characteristics, high signal-to-noise ratio, and less channel interference, which has better sound quality.
3. UHF transmission simultaneous transmission system: This mainly refers to the broadband-based G-band digital simultaneous transmission system developed in recent years. Taking the GONSIN 2.4 GHz wireless digital simultaneous transmission system as an example, the system uses an encrypted transmission technology called Direct Sequence Spread Spec-trum (DSSS), which has reliable anti-eavesdropping function. The receiving range is 80~100 m, and you can choose to answer 2~16 kinds of voices (8 kinds of voices are standard). Compared with the infrared transmission system, the advantage is that the reception is non-directional, unobstructed, and is not easily interfered by the radiation of the energy-saving lamp, and the requirements for the venue environment are relatively loose.
MAONO is an innovative designer and manufacturer of Lavalier, Podcasting, Wireless, Shotgun, Recording microphones and accessories for Smartphone, Camera and PC, etc.